style.css

/* ========== Design Tokens ========== */
:root {
    color-scheme: light dark;

    --bg: #f6f7fb;
    --bg2: #eef2ff;
    --surface: rgba(255, 255, 255, 0.78);
    --surface-solid: #ffffff;
    --text: #0b1220;
    --muted: rgba(11, 18, 32, 0.68);
    --border: rgba(15, 23, 42, 0.12);

    --accent: #1a73e8;
    --accent-strong: #185abc;

    --shadow-sm: 0 6px 18px rgba(15, 23, 42, 0.10);
    --shadow-md: 0 18px 48px rgba(15, 23, 42, 0.18);

    --radius: 14px;
    --tabbar-h: 56px;

    --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0b0f19;
        --bg2: #0f172a;
        --surface: rgba(17, 24, 39, 0.70);
        --surface-solid: rgba(17, 24, 39, 0.92);
        --text: rgba(255, 255, 255, 0.92);
        --muted: rgba(255, 255, 255, 0.64);
        --border: rgba(255, 255, 255, 0.10);
        --shadow-sm: 0 10px 26px rgba(0, 0, 0, 0.30);
        --shadow-md: 0 22px 60px rgba(0, 0, 0, 0.38);
    }
}

/* ========== 全体の基本設定 ========== */
html, body {
    height: 100%;
}

body {
    font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    overflow: hidden;
    background: radial-gradient(1200px 600px at 15% 0%, var(--bg2) 0%, transparent 60%),
                radial-gradient(900px 500px at 85% 10%, rgba(26, 115, 232, 0.14) 0%, transparent 55%),
                var(--bg);
    color: var(--text);
}

/* ========== タブバー全体 ========== */
#tab-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    height: var(--tabbar-h);
    box-sizing: border-box;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
    backdrop-filter: blur(14px) saturate(140%);
    -webkit-backdrop-filter: blur(14px) saturate(140%);
    -webkit-app-region: drag;
}

/* ========== タブのコンテナ ========== */
#tabs {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
    flex: 1;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;
}

#tabs::-webkit-scrollbar {
    width: 0;
    height: 0;
}

/* ========== 各アカウントタブ ========== */
.tab {
    cursor: pointer;
    user-select: none;
    max-width: 240px;
    padding: 8px 12px;
    border-radius: 999px;
    border: 1px solid transparent;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
    color: var(--muted);
    background: transparent;
    transition: background-color 160ms var(--ease), border-color 160ms var(--ease), transform 160ms var(--ease), color 160ms var(--ease);
    -webkit-app-region: no-drag;
}

.tab:hover {
    background: rgba(26, 115, 232, 0.10);
    color: var(--text);
}

.tab:active {
    transform: translateY(1px);
}

.tab.active {
    background: var(--surface-solid);
    border-color: var(--border);
    box-shadow: var(--shadow-sm);
    color: var(--text);
}

/* ========== 「+」アイコンボタン ========== */
#add-btn {
    margin-left: auto;
    width: 36px;
    height: 36px;
    background: rgba(26, 115, 232, 0.12);
    border: 1px solid rgba(26, 115, 232, 0.20);
    cursor: pointer;
    padding: 0;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    transition: transform 160ms var(--ease), background-color 160ms var(--ease), border-color 160ms var(--ease);
    -webkit-app-region: no-drag;
}

/* ========== サービス切替 ========== */
#service-switcher {
    -webkit-app-region: no-drag;
    display: flex;
    align-items: center;
}

#service-select {
    -webkit-app-region: no-drag;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    padding: 9px 34px 9px 12px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: var(--surface-solid);
    color: var(--text);
    font-weight: 650;
    letter-spacing: 0.01em;
    box-shadow: var(--shadow-sm);
    outline: none;
    cursor: pointer;
    position: relative;
    transition: transform 160ms var(--ease), border-color 160ms var(--ease);
}

#service-select:hover {
    transform: translateY(-1px);
}

#service-select:focus {
    border-color: rgba(26, 115, 232, 0.55);
    box-shadow: 0 0 0 4px rgba(26, 115, 232, 0.16), var(--shadow-sm);
}

/* ▼ をCSSだけで描画 */
#service-switcher {
    position: relative;
}

#service-switcher::after {
    content: "";
    position: absolute;
    right: 14px;
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 6px solid var(--muted);
    pointer-events: none;
}

#add-btn:hover {
    background: rgba(26, 115, 232, 0.18);
    border-color: rgba(26, 115, 232, 0.28);
    transform: translateY(-1px);
}

#add-btn:active {
    transform: translateY(0px) scale(0.98);
}

/* ========== モーダル（入力画面） ========== */
.hidden {
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
}

#modal {
    position: fixed;
    inset: 0;
    display: grid;
    place-items: center;
    opacity: 1;
    transition: opacity 180ms var(--ease);
    visibility: visible;
    -webkit-app-region: no-drag;
}

#modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(2, 6, 23, 0.22);
}

#modal-content {
    position: relative;
    width: min(420px, calc(100vw - 40px));
    padding: 20px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--surface-solid);
    box-shadow: var(--shadow-md);
    color: var(--text);
    transform: translateY(0) scale(1);
    transition: transform 200ms var(--ease);
}

#modal.hidden #modal-content {
    transform: translateY(10px) scale(0.98);
}

#modal-content h2 {
    margin: 0;
    font-size: 16px;
    font-weight: 650;
    letter-spacing: 0.01em;
}

#account-name-input {
    width: 100%;
    padding: 12px 12px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: rgba(26, 115, 232, 0.06);
    color: var(--text);
    box-sizing: border-box;
    margin-top: 12px;
    outline: none;
}

#account-name-input:focus {
    border-color: rgba(26, 115, 232, 0.55);
    box-shadow: 0 0 0 4px rgba(26, 115, 232, 0.16);
}

#modal-actions {
    margin-top: 16px;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

#modal-actions button {
    padding: 10px 14px;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 650;
    border: 1px solid transparent;
    transition: transform 160ms var(--ease), background-color 160ms var(--ease), border-color 160ms var(--ease);
    -webkit-app-region: no-drag;
}

#cancel-btn {
    background: transparent;
    color: var(--text);
    border-color: var(--border);
}

#cancel-btn:hover {
    background: rgba(255, 255, 255, 0.06);
}

#ok-btn {
    background: var(--accent);
    color: white;
}

#ok-btn:hover {
    background: var(--accent-strong);
    transform: translateY(-1px);
}

#ok-btn:active {
    transform: translateY(0px) scale(0.99);
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
        animation: none !important;
        scroll-behavior: auto !important;
    }
}